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Finding the Fourth Proportional to 30.46, 42.00 and 25.55

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Solution

The fourth proportional to 30.46, 42.00 and 25.55 is: 35.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.46 : 42.00 = 25.55 : x
  2. Step 2: Convert to fraction form
    30.46/42.00 = 25.55/x
  3. Step 3: Cross multiply
    30.46x = 42.00 × 25.55
  4. Step 4: Simplify right side
    30.46x = 1,072.76
  5. Step 5: Solve for x
    x = 1,072.76/30.46
  6. Step 6: Final answer
    x = 35.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.